package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.Config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignSearvice;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.utils.others.Other;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResponse;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.MultiBucketsAggregation;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;


import javax.naming.directory.SearchResult;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.atguigu.gulimall.search.utils.others.Show.doShow;


@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;


    @Autowired
    private ProductFeignSearvice productFeign;


    @Value("${searchUrl}")
    private String searchUrl;

    @Override
    public SearchResponse search(SearchParam param) {


        //动态构建出查询需要的DSL语句
        SearchResponse result = null;


        //1.准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);

        try {
            org.elasticsearch.action.search.SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);

            result = buildSearchResult(response, param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }


    /**
     * 构建检索请求
     * 模糊匹配，过滤（属性，分类，品牌，加个区间，库存）,排序，分页，高亮，聚合分析
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句

        /**
         * 模糊匹配，
         */
        //构建bool query
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();

        //1.1 must 模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQueryBuilder.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }

        //1.2 bool filter 按照三集分类id查询
        if (param.getCatalog3Id() != null) {
            boolQueryBuilder.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }

        //1.2 bool filter 按照品牌id查询
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQueryBuilder.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }

        //1.2 bool filter 按照所有指定的属性进行查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            for (String atr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = atr.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每一个都必须生成一个nested查询

                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQueryBuilder.filter(nestedQuery);
            }
        }


        //1.2 bool filter 按照是否有库存进行查询
        if (param.getHasStock() != null) {
            boolQueryBuilder.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }

        //1.2 bool filter 按照价格区间进行查询
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2) {
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    rangeQuery.lte(s[0]);
                }

                if (param.getSkuPrice().endsWith("_")) {
                    rangeQuery.gte(s[0]);
                }
            }
            boolQueryBuilder.filter(rangeQuery);
        }


        sourceBuilder.query(boolQueryBuilder);

        /**
         * 过滤（属性，分类，品牌，加个区间，库存）,排序，分页，高亮，
         */

        //2.1 排序
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder orders = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], orders);
        }

        //2.2 分页
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_SIZE);
        sourceBuilder.size(EsConstant.PRODUCT_SIZE);


        //2.3 高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        /**
         * 聚合分析
         */

        //品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");

        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);


        String s = sourceBuilder.toString();
        System.out.println("========================");
        System.out.println(s);
        System.out.println("========================");
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
//        return searchRequest;
        return searchRequest;
    }

    /**
     * 构建检索结果
     *
     * @param response
     * @return
     */
    private SearchResponse buildSearchResult(org.elasticsearch.action.search.SearchResponse response, SearchParam param) {

        SearchResponse result = new SearchResponse();

        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();

        List<SkuEsModel> skuEsModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].toString();
                    esModel.setSkuTitle(string);
                }
                skuEsModels.add(esModel);
            }
        }

        result.setProducts(skuEsModels);

        //2、当前所有商品涉及到的所有属性信息


        ParsedNested attr_agg = response.getAggregations().get("attr_agg");

        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");

        List<SearchResponse.AttrVo> attrVos = new ArrayList<>();
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResponse.AttrVo attrVo = new SearchResponse.AttrVo();

            //获取属性id
            long attrId = bucket.getKeyAsNumber().longValue();

            //获取属性名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();

            //得到属性的所有值
            List<String> attrValue = ((ParsedStringTerms) bucket.getAggregations()
                    .get("attr_value_agg"))
                    .getBuckets().stream()
                    .map(MultiBucketsAggregation.Bucket::getKeyAsString)
                    .collect(Collectors.toList());

            attrVo.setAttrValue(attrValue);
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);

        //3、当前所有商品涉及到的所有品牌信息
        List<SearchResponse.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResponse.BrandVo brandVo = new SearchResponse.BrandVo();
            //获取品牌id
            long brandId = bucket.getKeyAsNumber().longValue();

            //获取品牌名
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();

            //获取品牌图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();

            brandVo.setBrandId(brandId);
            brandVo.setBrandImg(brandImg);
            brandVo.setBrandName(brandName);
            brandVos.add(brandVo);
        }

        result.setBrands(brandVos);

        //4、当前所有简品涉及到的所有分类信息
        // result.setCatalogs( );
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResponse.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResponse.CatalogVo catalogVo = new SearchResponse.CatalogVo();

            //获取分类id
            catalogVo.setCatalogId(Long.parseLong(bucket.getKeyAsString()));

            //获取分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            catalogVo.setCatalogName(catalog_name_agg.getBuckets().get(0).getKeyAsString());

            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //5、分页信息、-页码
        result.setPageNum(param.getPageNum());

        //5、分页信息-总记录数

        long total = hits.getTotalHits().value;
        result.setTotal(total);

        //5、分页信息.-总.页码
        int pageSize = EsConstant.PRODUCT_SIZE;
        int totalPages = total / pageSize + total % pageSize == 0 ? 0 : 1;
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

//        System.out.println("================");
//        doShow(result.getPageNavs(),1);
//        System.out.println("totalPages:"+totalPages);
//        System.out.println("==============");
//        System.out.println();

        //构建面包屑导航功能
        List<SearchResponse.NavVo> navVos = result.getNavs();
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            navVos = param.getAttrs().stream().map(attr -> {
                SearchResponse.NavVo navVo = new SearchResponse.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeign.attrInfo(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    TypeReference<AttrResponseVo> typeReference = new TypeReference<AttrResponseVo>() {
                    };


                    AttrResponseVo data = Other.getData(r, "attr", typeReference);
                    navVo.setNavName(data.getAttrName());
                }
                String replace = replaceQueryString(param, attr, "attrs");
                navVo.setLink(searchUrl + replace);
                return navVo;
            }).collect(Collectors.toList());

            System.out.println();

        }
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            SearchResponse.NavVo navVo = new SearchResponse.NavVo();
            navVo.setNavName("品牌");
            R r = productFeign.info(param.getBrandId());
            if (r.getCode() == 0) {
                List<BrandVo> brand = Other.getData(r, "brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer replace = new StringBuffer();
                StringBuffer buffer = new StringBuffer();
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getName() + ";");
                    replace.append(replaceQueryString(param, brandVo.getBrandId().toString(), "brandId"));
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink(searchUrl + replace);
            }
            result.getNavs().add(navVo);

        }

        result.setNavs(navVos);

        return result;
    }

    private String replaceQueryString(SearchParam param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8").replace("+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        // 取消面包屑之后要跳转的地址
        String replace = param.get_queryString().replace("&" + key + "=" + encode, "");
        if (replace.equals(param.get_queryString())) {
            replace = param.get_queryString().replace(key + "=" + encode, "");
        }
        return replace;
    }


}
